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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating revenues    
Revenue from sales of electricity $ 2,509 $ 2,508
Other revenue 40 38
Total operating revenues 2,549 2,546
Operating expenses    
Fuel 475 568
Purchased power 220 242
Operating and maintenance 709 741
Depreciation and amortization 423 437
Tax equivalents 124 129
Total operating expenses 1,951 2,117
Operating income 598 429
Other income (expense), net 12 12
Interest expense    
Interest expense 322 339
Net income (loss) $ 288 $ 102